3d50059bbc
The API is the getter couterpart for setprocnetwork.
Use it in NetworkUtils so that the NDK API can be the source of truth
for the process network.
Bug: 171540887
Test: atest CtsNetTestCases
Tests in change I311b58585033c2ca50ce5477ea9cd94b6f127507
Change-Id: Ie8f68cf1fa57deddb63324c1abf3d6fd5b0ef500
132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <android/multinetwork.h>
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#include <errno.h>
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#include <NetdClient.h> // the functions that communicate with netd
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#include <resolv_netid.h> // android_getaddrinfofornet()
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#include <stdlib.h>
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#include <sys/limits.h>
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// This value MUST be kept in sync with the corresponding value in
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// the android.net.Network#getNetworkHandle() implementation.
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static const uint32_t kHandleMagic = 0xcafed00d;
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static const uint32_t kHandleMagicSize = 32;
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static int getnetidfromhandle(net_handle_t handle, unsigned *netid) {
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static const uint32_t k32BitMask = 0xffffffff;
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// Check for minimum acceptable version of the API in the low bits.
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if (handle != NETWORK_UNSPECIFIED &&
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(handle & k32BitMask) != kHandleMagic) {
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return 0;
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}
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if (netid != NULL) {
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*netid = ((handle >> (CHAR_BIT * sizeof(k32BitMask))) & k32BitMask);
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}
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return 1;
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}
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static net_handle_t gethandlefromnetid(unsigned netid) {
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if (netid == NETID_UNSET) {
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return NETWORK_UNSPECIFIED;
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}
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return (((net_handle_t) netid) << kHandleMagicSize) | kHandleMagic;
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}
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int android_setsocknetwork(net_handle_t network, int fd) {
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unsigned netid;
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if (!getnetidfromhandle(network, &netid)) {
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errno = EINVAL;
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return -1;
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}
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int rval = setNetworkForSocket(netid, fd);
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if (rval < 0) {
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errno = -rval;
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rval = -1;
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}
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return rval;
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}
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int android_setprocnetwork(net_handle_t network) {
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unsigned netid;
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if (!getnetidfromhandle(network, &netid)) {
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errno = EINVAL;
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return -1;
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}
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int rval = setNetworkForProcess(netid);
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if (rval < 0) {
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errno = -rval;
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rval = -1;
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}
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return rval;
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}
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int android_getprocnetwork(net_handle_t *network) {
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if (network == NULL) {
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errno = EINVAL;
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return -1;
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}
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unsigned netid = getNetworkForProcess();
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*network = gethandlefromnetid(netid);
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return 0;
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}
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int android_getaddrinfofornetwork(net_handle_t network,
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const char *node, const char *service,
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const struct addrinfo *hints, struct addrinfo **res) {
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unsigned netid;
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if (!getnetidfromhandle(network, &netid)) {
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errno = EINVAL;
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return EAI_SYSTEM;
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}
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return android_getaddrinfofornet(node, service, hints, netid, 0, res);
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}
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int android_res_nquery(net_handle_t network, const char *dname,
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int ns_class, int ns_type, enum ResNsendFlags flags) {
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unsigned netid;
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if (!getnetidfromhandle(network, &netid)) {
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return -ENONET;
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}
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return resNetworkQuery(netid, dname, ns_class, ns_type, flags);
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}
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int android_res_nresult(int fd, int *rcode, uint8_t *answer, size_t anslen) {
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return resNetworkResult(fd, rcode, answer, anslen);
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}
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int android_res_nsend(net_handle_t network, const uint8_t *msg, size_t msglen,
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enum ResNsendFlags flags) {
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unsigned netid;
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if (!getnetidfromhandle(network, &netid)) {
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return -ENONET;
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}
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return resNetworkSend(netid, msg, msglen, flags);
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}
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void android_res_cancel(int nsend_fd) {
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resNetworkCancel(nsend_fd);
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}
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